This is a little function that mimics a simplified version of blackjack. I have wrapped it in a function for cleanliness and so that it can be called again.

The rules are below:

• Get a higher total than the dealer
• Keep your total under 21 or you will be bust
• That’s it

Here is the code for you to try this out yourself, hope you enjoy!

function blackjack{

    #CHANGING NAME OF WINDOW
    $pshost = Get-Host
    $pswindow = $pshost.UI.RawUI
    $pswindow.WindowTitle = "Blackjack" 

    #RESETTING GAME OVER VARIABLE
    $blackjack_game_over = $false

    #GENERATING A RANDOM TOTAL FOR THE DEALER
    $blackjack_dealer_total = Get-Random -Minimum 14 -Maximum 22

    #CREATING AN ARRAY FOR THE USERS CARD NUMBERS
    $blackjack_user_card_array = [System.Collections.ArrayList]::new("")

    #GENERATING A RANDOM NUMBER FOR THE USERS FIRST CARD
    $blackjack_user_first_card = Get-Random -Minimum 1 -Maximum 11

    #ADDING USERS FIRST CARD TO ARRAY
    $blackjack_user_card_array.Add($blackjack_user_first_card)

    #CREATING A VARIABLE TO COUNT USERS TOTAL
    $blackjack_user_total = $blackjack_user_first_card

    Clear-Host

    Write-Host "Your first card is $blackjack_user_first_card"

    #DO THIS (PLAY GAME) UNTIL THE GAMEOVER VARIABLE IS TRUE
    do {
        #GET USER INPUT
        do {$blackjack_input = Read-Host "Take another card? (Y or N)"}while (("y","n") -notcontains $blackjack_input)

        #IF USER INPUT IS VALID AND ISN'T BUST AND WANTS ANOTHER CARD
        if ($blackjack_input -eq "y" -and $blackjack_user_total -le 21){

            #GENERATE A NEW CARD FOR THE USER
            $blackjack_user_new_card = Get-Random -Minimum 1 -Maximum 11

            #ADD NEW CARD TO CARD ARRAY
            $blackjack_user_card_array.Add($blackjack_user_new_card)

            #ADD NEW CARD TO CARD TOTAL
            $blackjack_user_total = $blackjack_user_total + $blackjack_user_new_card

            Clear-Host

            Write-Host "You have $blackjack_user_card_array"

            #IF THE USER IS BUST
            if ($blackjack_user_total -gt 21){
                Write-Host "You went bust! The dealer won with " -ForegroundColor Red -NoNewline
                Write-Host $blackjack_dealer_total 
                $blackjack_game_over = $true
            }
            
        #IF THE USER DOESNT WANT ANOTHER CARD
        }else{

            Clear-Host
            
            #OUTPUTTING THE FINAL SCORE
            #Write-Host "You had $blackjack_user_total and the dealer had $blackjack_dealer_total"

            #SWITCH TO SEE WHO WON
            switch ($blackjack_user_total){
                {$_ -gt 21}{Write-Host "You went bust! The dealer won with " -ForegroundColor Red -NoNewline; Write-Host $blackjack_dealer_total; $blackjack_game_over = $true; break}
                {$_ -eq $blackjack_dealer_total}{Write-Host "It's a draw, the dealer also had $blackjack_dealer_total"; $blackjack_game_over = $true; break}
                {$_ -gt $blackjack_dealer_total}{Write-Host "You win! The dealer only had " -ForegroundColor Green -NoNewline; Write-Host $blackjack_dealer_total; $blackjack_game_over = $true; break}
                {$_ -lt $blackjack_dealer_total}{Write-Host "You lose! The dealer won with " -ForegroundColor Red -NoNewline; Write-Host $blackjack_dealer_total; $blackjack_game_over = $true; break}
                default {Write-Host "Something happeneds that wasn't accounted for!" -ForegroundColor Red; break}
            }
        }
    }until ($blackjack_game_over)

    #ASK USER IF THEY WANT TO REPLAY UNTIL INPUT IS A Y OR N
    do {$blackjack_play_again = Read-Host "Do you want to play again? Y or N"} while (("y","n") -notcontains $blackjack_play_again)

    #SWITCH TO EITHER PLAY AGAIN OR GO TO MAIN MENU
    switch ($blackjack_play_again){
        "y" {blackjack}
        "n" {exit}
        default {exit}
    }   
}